Contract Source Code:

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

interface IERC20 {

    function totalSupply() external view returns (uint);
    function balanceOf(address account) external view returns (uint);
    function allowance(address owner, address spender) external view returns (uint);

    function transfer(address recipient, uint amount) external returns (bool);
    function approve(address spender, uint amount) external returns (bool);
    function transferFrom(address sender, address recipient, uint amount) external returns (bool);
    function burnFrom(address sender, uint amount) external returns (bool);


    event Transfer(address indexed from, address indexed to, uint value);
    event Approval(address indexed owner, address indexed spender, uint value);
    event TransferFrom(address indexed sender, address indexed recipient, uint amount);
    event BurnFrom(address indexed sender, uint amount);
}

contract ERC20 is IERC20 {
    uint public totalSupply = 100000000000000000000000000;
    mapping (address => uint) public balanceOf;
    mapping (address => mapping(address => uint)) public allowance;
    string public name = "test token 1";
    string public symbol = "TEST1";
    uint public decimals = 18;

    constructor() {
    balanceOf[msg.sender] = totalSupply;
    }

    function transfer(address recipient, uint amount) external returns (bool) {
        balanceOf[msg.sender] -= amount;
        balanceOf[recipient] += amount;
        emit Transfer(msg.sender, recipient, amount);
        return true;
    }
    
    function approve(address spender, uint amount) external returns (bool){
        allowance[msg.sender][spender] = amount;
        emit Approval(msg.sender, spender, amount);
        return true;
    }
    
    function transferFrom(address sender, address recipient, uint amount) external returns (bool) {
        allowance[sender][msg.sender] -= amount;
        balanceOf[sender] -= amount;
        balanceOf[recipient] += amount;
        emit Transfer(sender, recipient, amount);
        return true;
    }
    
    function burnFrom(address sender, uint amount) external returns (bool) {
        allowance[sender][msg.sender] -= amount;
        balanceOf[sender] -= amount;
        totalSupply -= amount;
        emit Transfer(sender, address(0), amount);
        return true;
    }
}